Number and rate (%) of respondents regularly riding motorcycle as the driver or a passenger from the 2001 and 2009 Taiwan National Health Interview Surveys
| 2001 | 2009 | p Value | |||||
|---|---|---|---|---|---|---|---|
| n | % | 95% CI | n | % | 95% CI | ||
| Total | 16 100 | 87.9 | (87.4 to 88.3) | 17 948 | 92.5 | (92.1 to 92.9) | <0.0001 |
| Sex | |||||||
| Male | 8131 | 89.3 | (88.7 to 90.0) | 8553 | 92.5 | (91.9 to 93.0) | <0.0001 |
| Female | 7969 | 86.4 | (85.7 to 87.1) | 9395 | 92.5 | (92.0 to 93.0) | <0.0001 |
| Age group (years) | |||||||
| 12–17 | 1829 | 84.4 | (82.9 to 85.9) | 2154 | 92.1 | (91.0 to 93.2) | <0.0001 |
| 18–24 | 2735 | 95.5 | (94.7 to 96.2) | 2524 | 97.9 | (97.3 to 98.4) | <0.0001 |
| 25–44 | 7167 | 90.2 | (89.6 to 90.9) | 7575 | 93.9 | (93.4 to 94.5) | <0.0001 |
| 45–64 | 4369 | 81.7 | (80.7 to 82.7) | 5695 | 88.6 | (87.9 to 89.4) | <0.0001 |
| Urbanisation level | |||||||
| Rural | 4848 | 90.6 | (89.8 to 91.3) | 4661 | 91.6 | (90.8 to 92.4) | 1.1611 |
| Suburban | 2882 | 90.5 | (89.5 to 91.6) | 3133 | 93.0 | (92.3 to 93.8) | 0.0005 |
| Urban | 4214 | 89.0 | (88.1 to 89.9) | 4545 | 94.1 | (93.4 to 94.9) | <0.0001 |
| Metropolitan | 3935 | 82.0 | (80.9 to 83.1) | 5592 | 91.2 | (90.5 to 91.9) | <0.0001 |
| SII | −0.025 | (−0.029 to −0.021) | 0.002 | (−0.001 to 0.006) | <0.0001 | ||
| RII | 0.785 | (0.753 to 0.818) | 1.040 | (0.896 to 1.097) | <0.0001 | ||
| Education level | |||||||
| Primary or lower | 3,22 | 84.2 | (83.0 to 85.4) | 2226 | 89.8 | (88.6 to 91.0) | <0.0001 |
| Secondary | 3385 | 89.2 | (88.3 to 90.2) | 3276 | 92.6 | (91.8 to 93.5) | <0.0001 |
| High school | 5697 | 90.4 | (89.7 to 91.2) | 6176 | 94.2 | (93.6 to 94.7) | <0.0001 |
| College or higher 3792 | 86.2 | (85.2 to 87.2) | 6262 | 91.8 | (91.1 to 92.4) | <0.0001 | |
| SII | −0.001 | (−0.006 to 0.004) | −0.003 | (−0.011 to 0.002) | 0.6367 | ||
| RII | 0.979 | (0.932 to 1.029) | 0.938 | (0.877 to 1.003) | 0.4154 | ||
| Household monthly income (NT dollars) | |||||||
| <=29 999 | 2956 | 86.8 | (85.7 to 88.0) | 3414 | 91.8 | (91.0 to 92.7) | <0.0001 |
| 30 000–49 999 | 3878 | 90.2 | (89.3 to 91.1) | 3797 | 94.7 | (94.0 to 95.4) | <0.0001 |
| 50 000–69 999 | 3643 | 89.6 | (88.7 to 90.6) | 3191 | 94.5 | (93.7 to 95.2) | <0.0001 |
| 70 000–99 999 | 2929 | 87.6 | (86.5 to 88.8) | 2491 | 92.8 | (91.8 to 93.8) | <0.0001 |
| >=100 000 | 2540 | 83.6 | (82.2 to 84.9) | 2378 | 87.8 | (86.5 to 89.0) | <0.0001 |
| SII | −0.006 | (−0.010 to −0.003) | −0.012 | (−0.016 to −0.010) | 0.2252 | ||
| RII | 0.941 | (0.909 to 0.975) | 0.839 | (0.801 to 0.879) | 0.0015 | ||
SII=slope index of inequality (ie, linear coefficient) according to linear regression model.
RII=relative index of inequality (ie, OR) according to logistic regression model.